elements

The day of Elements has arrived, starting shortly in Wellcome Collection. And that means it’s time for our final Elements film and blog post, on copper.

A beautiful metal that comes in various gorgeous shades of blue, green or, well, copper, depending on its state, copper is also incredibly useful. Its electrical conductivity in particular has been central to our systems for transmitting information, done through copper wires. This property, said Andrea, really transformed the world in the 19th Century following the work of Charles Wheatstone in the area of telegraphy.

It also makes really great cookware, because of its thermal conductivity. Andrea has a lovely copper pan which you can see early on in the film, but using copper directly with food can result in the food having a slightly metallic tan. We had a go at filming the tinning process necessary to coat the copper and stop this transferring to the food, but, ah, it didn’t go very well so that didn’t make the cut!

Hope you enjoy the event tonight. You can see the full playlist of Elements films, including last year’s, on this YouTube playlist. For more information about the event, which is happening today, (Friday 22 June) from 19.00 to 23.00 at Wellcome Collection, see here.

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Gold is the third in our series of films created to tie in with Friday’s Elements event (the previous two were tin and silver). This beautiful metal has played a huge and important part in human history, but how much do you know about its actual properties?

One of the appealing features of this metal is its constancy; it doesn’t tarnish or change over time. But it isn’t as unreactive as it seems. One of the experiments that Andrea demonstrates in the film above is what happens when you drop mercury onto gold leaf. The gold dissolves into the mercury, leaving an amalgam. This process has been used to separate out gold in the mining process, after which the mercury and gold amalgam is heated and the mercury evaporates away again. However, mercury is toxic, and Andrea pointed out that in some places careless use of this process allows mercury to escape into the environment and into water systems.

Another way of dissolving gold is to use ‘aqua regia’, which is also demonstrated in the film. Andrea told me that Niels Bohr used this trick to dissolve his gold Nobel Prize to keep it out of the hands of the Nazis. The gold Nobel Prize solution was left untouched by them during the war, and he was able to retrieve it afterwards, precipitate out the gold and send it back for recasting.

You can see the full playlist of Elements films, including last year’s, on this YouTube playlist. For more information about the event, which is happening this Friday (22 June) from 19.00 to 23.00 at Wellcome Collection, see here.

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The second in our series of Elements films is silver (the first was tin, which you can read more about in yesterday’s blog post). In the video above, Andrea Sella talks about what is behind silver’s tendency to tarnish and how you can restore it to its natural brilliance with a simple trick.

It’s not in the video, but Andrea also told me about his prized Dewar flask (see the picture). Andrea has an interest in glassware and its history, and this is his favourite piece. Towards the end of the 19th century, physicists were working on liquifying air and needed some means of storing this very cold liquid for long periods. This container would require really good insulation. James Dewar, who was working at the Royal Institution, came up with the solution that would become known as a Dewar flask.

Andrea Sella with a silver-lined Dewar flask

The flask has an inner and outer ‘shell’ of glass, which have a vacuum between them that ensures that energy can’t be easily transmitted from the inside to the outside of the flask. But Dewar also used a technique that created a very thin layer of silver on the inside of the glass. It’s this that gives it the beautiful reflectiveness which helps to keep heat out. It is, as Andrea says, perfect double glazing.

You can see the full playlist of Elements films, including last year’s, on this YouTube playlist. For more information about the event, which is happening this Friday (22 June) from 19.00 to 23.00 at Wellcome Collection, see here.

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This Friday sees the return of Elements at Wellcome Collection – this time on gold, silver and bronze (tin and copper). I also returned to Andrea Sella‘s lab at University College London to film short pieces about each element and find out what makes each of them special.

The video above is our examination of tin. It cries, and it makes other beautiful sounds in the form of bells and church organ pipes, but it is also susceptible to a strange ‘disease’: tin pest. Andrea has been hard at work these past few months trying to recreate tin pest and shows us how he did it.

Although it didn’t make the cut, Andrea also pointed out that tin is used in our mobiles phones in its oxide form as part of the display. Cassiterite is the main source of tin, and in ancient times there was enough of this being mined in Cornwall for Britain to become known as the “tin islands”, the Cassiterides. But today, most of our tin comes from Central Africa, especially the Democratic Republic of the Congo. The huge amounts of money involved, said Andrea, are fueling civil war in the DRC. Perhaps, therefore, we should be rethinking this relationship with tin.

You can see the full playlist of Elements films, including last year’s, on this YouTube playlist. For more information about the event, which is happening this Friday (22 June) from 19.00 to 23.00 at Wellcome Collection, see here.

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The final Elements video from my shoot with Dr Andrea Sella takes a look at iodine, an element with many different guises. I could have spent all day filming the smoking purple iodine, it was quite beautiful.

Elements presents a world of immersive chemical performance, ingestion, activity and intrigue across all four floors of Wellcome Collection on Friday 8 April, 19.00–23.00.

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This is the second, rather noisy, video from my shoot for Elements with Dr Andrea Sella (it’s the equipment making that noise, by the way). This time we’re messing about with mercury. The jar really is astonishingly heavy.

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In advance of the upcoming Elements event at Wellcome Collection I spent an hour filming the brilliant Dr Andrea Sella (one of the event’s curators) as he gave me a tour of some of the elements in question. I’ll be sharing these on the blog over the next week or so, but you can also see all of them on our YouTube channel. It was a fun shoot, following him as he demonstrated experiments and bits of lab kit. There was a small fiery explosion, liquid nitrogen, clouds of purple iodine and more. I also get an inadvertent cameo role as he naughtily wore reflective glasses for the oxygen section, which I spotted too late.

In this first one, he shows us how oxygen will be turned from a gas into a liquid for use at the event (which has to happen behind the scenes on the night for health and safety reasons), and reveals its unusual colour. I had NO idea that this was what oxygen looked like.

Elements presents a world of immersive chemical performance, ingestion, activity and intrigue across all four floors of Wellcome Collection on Friday 8 April, 19.00–23.00.

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